JPH0946094A - Component mounting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To balance the speed of the mounting machines, and minimize the frequency of the case that components ran out. SOLUTION: From CAD data, the number of components to be used is calculated for each component. Components are so assigned to each mounting machine constituting a mounting line that the speed is made uniform. Under the assigned condition, simulation concerning the frequency of the case that components are out of stock is performed for each mounting machine, on the basis of the input number of components to a supply means, the estimated production number of boards, etc. The items of components which are frequently out of stock are divided and assigened to a plurality of the component supply means, and the frequency of the case that components are out of stock is made uniform among the mounting machines. Further simulation is performed. In order to make the balance uniform between the mounting machines, the changing process of supply means among the mounting machines is repeated. Hence the arrangement of supply means is datermined wherein the speed and the frequency of the case that components are out of stock become uniform.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a component mounting method in a mounting line in which a large number of mounting machines are arranged, and more particularly to a component mounting method that minimizes the number of times a component runs out.

[0002]

2. Description of the Related Art Conventionally, when a mounted component is distributed to each mounting machine in a method of mounting a component on a mounting line, the NC data creator of the mounting machine performs the distribution work based on the experience so far, and then each mounting machine is mounted on the mounting line. The takt time is measured with a stopwatch, and distribution adjustment is performed so that the tact balance can be achieved among the mounting machines according to the measurement result.

Further, in the distribution method described in Japanese Patent Application No. 4-51427, the tact balance adjustment between the mounting machines is repeatedly performed so as to determine the component arrangement so that the component arrangement is aimed mainly at equalizing the tact balance. ing. Based on the result, the site operator further divides the component supply means so as to reduce the number of parts out as much as possible, and makes a final decision after trial of several patterns.

[0004]

However, the above-mentioned conventional distribution method requires experience and skill in the distribution work and takes a long time, and after that, it is necessary to measure it on the mounting line and manually perform the distribution adjustment. The problem is that it requires more experience and time.

In view of the above-mentioned conventional problems, it is an object of the present invention to provide a component mounting method capable of achieving a tact balance between mounting machines and minimizing the number of component breaks.

[0006]

According to the component mounting method of the present invention, information on a board on which a component is mounted is obtained from CAD data, and NC data for driving a mounting machine is obtained by using a mounting database in which mounting information is recorded. Is a component mounting method for operating the mounting machine based on this NC data, calculating the number of uses for each component from the captured CAD information, and leveling the tact balance for each mounting machine that constitutes the mounting line. The parts are distributed as described above, and the simulation result of the number of parts shortages is calculated for each mounting machine based on the conditions such as the number of parts in the supply means, the planned production quantity of the board, etc. Is divided into a plurality of supply means for a part number having a large number of times of parts cut, and the number of times of parts cut is equalized among mounting machines.

[0007] Preferably, after dividing the required supply means into a plurality of parts so as to level out the number of parts out, a tact simulation is carried out, and the supply means other than each other are provided so as to level the tact balance among the mounting machines. The process of exchanging with the mounting machine is repeated, and the arrangement of the supplying means is determined so that the tact and the number of times of parts cut out are equalized between the mounting machines.

[0008]

According to the component mounting method of the present invention, the CAD data, the mounting data, and the production plan such as the number of parts of the supply means for each part, the planned number of parts, and the like are used, and the virtual tact balance is mainly used. By deciding the parts arrangement, performing a preliminary simulation of the occurrence frequency of parts shortage in each mounting machine when executing the production plan under the arrangement, and dividing the required supply means into multiple parts so that the number of times of parts shortage is leveled. It is possible to minimize the number of parts out.

Further, by performing a tact simulation and exchanging the supply means between the mounting machines so that the tact balance can be achieved among the respective mounting machines, the tact balance can be maintained and the efficient component mounting can be achieved with a minimum number of component outages. realizable.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A component mounting method in a mounting line according to an embodiment of the present invention will be described below with reference to FIGS.

First, the overall structure of the mounting equipment will be described with reference to FIG. A plurality of mounting lines 3 in which the mounting machines 2 are arranged in a line are formed in the mounting equipment 1. A control device 4 is connected to the control unit of each mounting machine 2 that constitutes each mounting line 3. The control device 4 distributes the mounting components to be mounted to each mounting machine 2 and inputs the CAD data of the distributed mounting components.

Therefore, a CAD system 5 is connected to the control device 4, and CAD data is input from the CAD system 5 for each board on which components are mounted. Further, the data of the mounting database 6 including the mounting machine database 7a storing the data relating to each mounting machine 2 and the component database 7b storing the data relating to each mounting component are input. The CAD data may be input to each mounting machine 2 separately.

Next, the operation of allocating the mounting components to each mounting machine 2 in the control device 4 will be described with reference to FIGS.

In FIGS. 2 and 3, first, in step # 1,
In # 2 and # 3, specify and input the board model to which the component is to be mounted and its production plan, and CAD the board model.
Data is designated and input, and mounting line 3 is designated. At this time, the production plan and CAD data of each of the plurality of board models to be flown to the mounting line 3 are input.

Subsequently, in step # 4, the distribution method (primary distribution) in consideration of the tact balance is carried out by the same distribution method that emphasizes the tact balance as in the conventional example. Table 1 shows an example of the result of the primary distribution.

[0016]

[Table 1]

Table 1 shows an example of the results when one board and one model are used.

Next, the required number of parts is calculated for each part based on the production plan input in step # 5, and step # 6
In the step # 7, the number of pieces of the parts of the supply means (for example, 100 pieces of the parts a stored in the parts supply cassette is 100) is read from the parts database for each part number. In the case of production based on the production plan, a part out simulation is performed to evaluate the number of parts out of the mounter due to part out. More steps #
Table 2 and FIG. 4 show examples of the results of Nos. 5, # 6 and # 7.

[0019]

[Table 2]

In this example, there are three parts a, two parts b on the board A, two parts a, two parts b on the board B, and five parts a on the board C. 2 boards b are mounted, respectively, and 200 boards A and 50 boards B are mounted.
This is an example in which 40 sheets and the substrates C are continuously produced, and it is assumed that the component a is distributed to the mounting machine 1 and the component b is distributed to the mounting machine 2 in the primary distribution. Further, Table 2 and FIG. 4 show only parts relating to the parts a and b. In order to understand partly in detail for understanding FIG. 4, the component a in the mounting machine 1 is 3
By the time the mounting on the three boards A is completed, 99 pieces have been used, and at that time, the component supply cassette
00) must be replaced. Then, when the mounting of the component a on the 200 boards A is completed, the component supply cassette has already been replaced six times, and at that time, 94 components a remain in the component supply cassette. And is subsequently used for mounting on the board B.

In Table 2 and FIG. 4, when the boards A to C are continuously produced, the mounting machines 1 and 9 are stopped 9 times and 5 times, respectively, due to the parts a and b being out of stock. Even if the tact balance is maintained for each substrate, such a stop due to the component shortage causes an operation stop of the entire line, which directly leads to a decrease in the operation rate and is required to be avoided as much as possible.

Therefore, in step # 8, step #
Based on the simulation result of 7, it is determined whether or not the number of times of component cutout is leveled for each mounting machine.
In the present embodiment, as described above, even when the number of parts out of the mounting machines is evaluated as 2 parts, there is a difference of 4 times.
Carry out 9 reassignments (secondary assignment). In this step # 9, based on the table 2 created in steps # 5 and # 6, the number of parts supply means (cassettes) is increased by 1 for the parts having a large number of parts out, The process of re-evaluating by the number-of-parts simulation shown in # 7 is repeated.

In Table 3 and FIG. 5, first, the number of the component supply means (cassette) for the component a having the maximum number of component outs is increased by one, and then the component supply of the component b having the maximum number of component outs is supplied next. The result at the time of increasing the number of means (cassettes) by one is shown. At this point, 9 for each of parts a and b
The number of out-of-parts has decreased from 4 times to 5 times to 2 times.

[0024]

[Table 3]

In this way, if the number of times of component outages is not leveled among the mounters in the determination of step # 8, step # 9 is executed again for the mounter having a large number of times of component loss according to the simulation result. This is repeated until the number of times the parts of the mounter forming the line run out reaches a desired level.

As a result of the repetition of step # 9, the number of out-of-components is leveled in the determination of step # 8. Then, in step # 10, one piece of CAD data is created based on the leveled virtual part placement. Tact simulation is carried out for. An example of the result is shown in Table 4.

[0027]

[Table 4]

Next, at step # 11, it is judged whether or not tact balance is obtained as a result of the tact simulation. In the results of Table 4, since the mounting tact (19.54 sec) of the mounting machine 1 indicated by the underline is particularly large as compared with the others, this is a bottleneck and it is determined that the tact balance of the line is not balanced. It In that case, in step # 12, the component supply means (cassette) is exchanged between the mounting machines on the line based on the leveled virtual component placement resulting from the component exhaustion in step # 9 (third sorting). ). This step # 10, # 11, # 1
The processing and judgment of 2 are repeated until the tact balance falls within the allowable range. When the tact balance is within the allowable range, the occurrence of parts shortage is minimized, and the arrangement of the parts supply means (cassette) with a good tact balance is realized.
In step # 13, the component supply means (cassette)
Determine the sequence of.

Table 5 and FIG. 6 show the final result component arrangement and the occurrence state of component shortage in that case, and Table 6 shows the tact simulation result by the component arrangement.

[0030]

[Table 5]

[0031]

[Table 6]

An example of the final result is a result of repeating the above steps so that the number of times of parts out and the tact are leveled among the mounting machines. In this example, from the primary distribution result, the secondary distribution is performed by the secondary distribution. For the component a, one component supply means to three component supply means, and for the component b, two.
It is divided into one component supply means, and one component supply means is replaced from the mounting machine 1 to the mounting machine 2 by the third distribution.

[0033]

According to the component mounting method of the present invention, as is apparent from the above description, the CAD data, the mounting data, and the production plan such as the number of parts of the supply means for each part, the number of parts to be produced, and the like are set. By using it, we decide a virtual component array centered on tact balance, and perform a preliminary simulation of the frequency of component outages on each mounting machine when executing the production plan under that array,
By dividing the required supply means into multiple parts so that the number of out-of-components is leveled, the number of out-of-components can be minimized. It is possible to improve the line operating rate by improving the point that the power consumption decreases. .

Furthermore, by performing a tact simulation and exchanging the supply means between the mounting machines so that the tact balance can be achieved among the mounting machines, efficient component mounting can be achieved with tact balance and a minimum number of component cuts. Can be realized.

[Brief description of drawings]

FIG. 1 is an overall schematic configuration diagram of a component mounting facility according to an embodiment of the present invention.

FIG. 2 is a first partial view of a flowchart of a component allocation operation of the same embodiment.

FIG. 3 is a second partial view of the flowchart of the component allocation operation of the same embodiment.

FIG. 4 is an explanatory diagram of a state of parts shortage after primary sorting in the embodiment.

FIG. 5 is an explanatory diagram of a component out state during secondary sorting in the embodiment.

FIG. 6 is an explanatory view of a state of parts shortage after tertiary sorting in the embodiment.

[Explanation of symbols]

 2 Mounting machine 3 Mounting line 4 Control device 5 CAD system 6 Mounting database

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kenichi Sato 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (2)

[Claims] 1. Information on a board on which a component is mounted is provided as C.
A component mounting method for obtaining NC data for driving a mounting machine using a mounting database in which mounting information is recorded, which is obtained from AD data, and operates the mounting machine based on the NC data. Calculate the number of used parts for each part, distribute the parts to each mounter that composes the mounting line so that the tact balance is leveled, and once allocate the parts, the number of parts in the supply means and the board schedule Based on the conditions such as the number of productions, a simulation of the number of parts shortages is performed for each mounting machine, and the simulation result is used to divide the number of parts with a large number of parts shortages into multiple supply means to level the number of parts shortages among mounting machines. Component mounting method characterized by the following: 2. A required supplying means is divided into a plurality of parts so as to level out the number of parts out, and then a tact simulation is performed, so that the supplying means is equalized to other mounting machines so that the takt balance is leveled among the respective mounting machines. 2. The component mounting method according to claim 1, wherein the arrangement of the supplying means is determined so that the tact and the number of times of component breakage are leveled among the mounting machines by repeating the process of exchanging between the mounting machine and the mounting machine.